Colors in the Dark

I got home from lab late last night and my roommate had already gone to sleep. I didn't want to disturb him so I didn't turn any lights on. My eyes had adjusted to the dark and there was just enough light from the street lamp beaming through our blinds that I could make out shapes and figures to avoid crashing into anything in my apartment, but as I passed the mirror on my way to bed I noticed something strange. I was wearing a Full Sail t-shirt that had orange lettering on it and I was able to see that the letters were in fact orange. I knew this was impossible. I shouldn't be able to see colors in such darkness. I had just learned about this in lecture. But there before my eyes I could see the letters on my shirt in orange. I looked around my room and I was able to see a couple of other things in color such as the red on one of my jackets, the yellow paper on a legal pad, and the blue of an ethernet cable. However most things appeared in black and white or shades of grey as they should. I looked at some of the posters on my wall, but no matter how hard I looked at them I couldn't determine their color. I looked at the orange letters on my shirt again and I figured that since I knew the letters on my shirt were orange my brain must have been filling in the colors, and it was doing this for other things that I knew had a specific color. Obviously I can't remember the color of every object so my brain can't fill in every color. I want to do an experiment to see how well I can see colors in the dark.